Have you tried switching to a default WordPress theme like Twenty Twelve to see if that resolves the issue? It is possible that there is a bug in your theme (have you checked for available updates for your theme and plugins?) and that prevents the page from working. I doubt it’s an issue with the WooCommerce plugin since I just tested it on multiple machines and browsers, it all works fine.

anyone knows why this still happens?
Deactivating plugins does not help.
changing theme to “twenty eleven” makes it work.
On another theme named MIO it does not work either.
This is clearly a theme-related issue. The theme support on my theme “the retailer” cant help me. Going mad over here..